191 



ON A NEW VARIETY OF PLANISPIRA ZEBRA, PER., FROM THE 

 ISLAND OF GISSER, AND A NEW SPECIES OF GHLORITW 

 FROM JAVA. 



By the Rev. E.. Ashington Bullen, F.L.S., E.G.S. 



Read Wth November, 1904. 



PLATE XI. 



My friend Lieutenant V. Brooke Webb, R.jS"., who was engaged in 

 charting parts of the Eastern seas about 1892-3, informs me that the 

 Isle of Gisser is a low sandy atoll-formed island, about one-third of 

 a mile in diameter, and surrounded by a reef, situated five miles from 

 the south-east point of Ceram, and close to Ceram Laut, in lat. 3° 53' S., 

 long. 130° 52' E. 



Erom this island some very beautiful varieties of Xesta eitrina 

 (PI. XI, Eigs. 3-11) were obtained, also the interesting variety of 

 Planispira zebra. 



Planispira zebra, var. Kollert, n.var. PI. XI, Fig. 1. 



Testa orbicularis, perspective mcdiocriter umbilicata, subtenuis, 

 translucens, albido-fulva, fasciis angustis brunneis_ 4-5 radiisque 

 obscuris fuscis inferne ornata, et flammulis brunneis supra picta, 

 periostraco molli induta, striis sat distinctis, baud vero magnopere 

 notatis sculpta; spira concave depressa ; anfractus 4^ convexi, sensim 

 accrescentes, sutura subprofunda discreti, primus subnitidus ; apcrtura 

 oblique lunata ; peristoma album, nitidum, expansum, reflexum, 

 pr^sertim ad latus externum, supra umbilicum aliquantulum reflexum. 

 Diam. maj. 21-5, min. 18 mm.; alt. 10 mm. 



Yar. b. Testa fasciis angustioribus, radiis lateris inferioris bene 

 notatis. 



Yar. c. Testa fasciis paene obsoletis, radiis lateris inferioris mag- 

 nopere distinctis. 



Yar. d. Testa fasciis coalescentibus ; latus inferum brunneum, 

 fasciis albido-fuscis aliquaudo submoniliformibus. 



It was a matter of difficulty to settle upon the most typical form 

 of this variety, as the distinctive characters of the shell, with regard 

 to the colour-markings, are so variable, the shape and size, however, 

 being fairly constant. 



I have, therefore, regarded as typical, a specimen that distinctly 

 shows the greatest number of general characteristics, and I have been 

 compelled to treat the other specimens as variants. This, I fear, 

 may appear somewhat arbitrary, but it seemed the best way to 

 secure a base-line for comparison. 



